package com.shanghaionstar.utils;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.ListView;

import com.onstar.cn.common.util.CommonUtil;

public class ViewUitl {
    private static final int ITEM_HEIGHT = 300;
    private static final int ITEM_HEIGHT_DP = 75;

    /**
     * 获取Listview的高度，然后设置ViewPager的高度
     *
     * @param listView
     * @return
     */
    public static int setListViewHeightBasedOnChildren(Context context, ListView listView) {
        //获取ListView对应的Adapter
        ListAdapter listAdapter = listView.getAdapter();
        final int dpHeight = CommonUtil.dp2px(ITEM_HEIGHT_DP, context);
        if (listAdapter == null) {
            return 0;
        }

        int totalHeight = 0;
        for (int i = 0, len = listAdapter.getCount(); i < len; i++) {
            //listAdapter.getCount()返回数据项的数目
            View listItem = listAdapter.getView(i, null, listView);
            try{
                listItem.measure(0, 0); //计算子项View 的宽高
                totalHeight += listItem.getMeasuredHeight(); //统计所有子项的总高度
            }catch(Exception e) {//适配特殊机型， 不支持以上measure
                totalHeight += dpHeight; //统计所有子项的总高度
            }
        }

        ViewGroup.LayoutParams params = listView.getLayoutParams();
        params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
        //listView.getDividerHeight()获取子项间分隔符占用的高度
        //params.height最后得到整个ListView完整显示需要的高度
        listView.setLayoutParams(params);
        return params.height;
    }

}
